<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="test" />
      </div>

      <!-- login form -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- username -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
        </el-form-item>
        <!-- password -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="el-icon-lock"
            type="password"
            show-password
          ></el-input>
        </el-form-item>
        <!-- button -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">Login</el-button>`
          <el-button type="info" @click="resetLoginForm">Reset</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 登录对象的绑定
      loginForm: {
        username: '',
        password: ''
      },
      // 表单验证规则
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '用户名不能为空' },
          { min: 3, max: 10, message: '长度在3到10之间' }
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '密码不能为空' },
          { min: 6, max: 15, message: '长度在6到15之间' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮重置登录表单
    resetLoginForm () {
      // this指向登录组件的实例
      console.log(this)
      // 通过this可以获取引用对象
      this.$refs.loginFormRef.resetFields()
    },
    login () {
      // 预验证
      this.$refs.loginFormRef.validate(async valid => {
        // console.log(valid);
        if (!valid) return
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功')

        // 保存token
        window.sessionStorage.setItem('token', res.data.token)
        // 页面跳转
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
}

.login_box {
  width: 450px;
  height: 300px;
  border-radius: 3px;
  background-color: #ffffff;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
}
.avatar_box {
  height: 130px;
  width: 130px;
  border: 1px solid #eee;
  border-radius: 50%;
  padding: 10px;
  box-shadow: 0 0 10px #ddd;
  position: absolute;
  left: 50%;
  transform: translate(-50%, -45%);
  background-color: #ffffff;
  img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background-color: #eee;
  }
}

.btns {
  display: flex;
  justify-content: flex-end; // 尾部对其
}

.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
</style>
